Python ctypes: Python file object <-> C FILE *

Question

I am using ctypes to wrap a C-library (which I have control over) with Python. I want to wrap a C-function with declaration:

int fread_int( FILE * stream );
         


        

Answer 1

If you want to use stdout/stdin/stderr, you can import those variables from the standard C library.

libc = ctypes.cdll.LoadLibrary('libc.so.6')
cstdout = ctypes.c_void_p.in_dll(libc, 'stdout')

Or, if you want to avoid using void* for some reason:

class FILE(ctypes.Structure):
    pass

FILE_p = ctypes.POINTER(FILE)

libc = ctypes.cdll.LoadLibrary('libc.so.6')
cstdout = FILE_p.in_dll(libc, 'stdout')